Classifications

• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B7/00—Halogens; Halogen acids
  • C01B7/01—Chlorine; Hydrogen chloride
  • C01B7/03—Preparation from chlorides
  • C01B7/04—Preparation of chlorine from hydrogen chloride
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
  • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
  • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
  • B01J23/46—Ruthenium, rhodium, osmium or iridium
  • B01J23/462—Ruthenium
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
  • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
  • B01J21/063—Titanium; Oxides or hydroxides thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
  • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
  • B01J21/066—Zirconium or hafnium; Oxides or hydroxides thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
  • B01J37/02—Impregnation, coating or precipitation
  • B01J37/03—Precipitation; Co-precipitation

Definitions

• a main object of the present invention is to provide a process for producing chlorine, comprising oxidation of hydrogen chloride, which makes it possible to produce chlorine at a lower reaction temperature using smaller amount of a catalyst having high activity.
• the ruthenium catalyst used for the present invention means a catalyst containing at least ruthenium or a ruthenium compound, and examples thereof include commercially available supported ruthenium catalyst, ruthenium oxide catalyst, catalyst obtained by supporting a ruthenium compound on a carrier, ruthenium mixed oxide catalyst, ruthenium black, etc.
• supported catalyst examples include supported metal ruthenium catalyst etc. which are prepared by supporting on a carrier such as alumina, silica, silica alumina, zeolite, diatomaceous earth, oxide and mixed oxide of elements (e.g. titanium oxide, zirconium oxide, vanadium oxide, etc.), metal sulfate, etc. according to a known process (see Shokubai Kouza, Shokubai Jikken Handbook, 1986, page 20, published by Kodan-sha). Commercially available catalysts can also be used.
• a carrier such as alumina, silica, silica alumina, zeolite, diatomaceous earth, oxide and mixed oxide of elements (e.g. titanium oxide, zirconium oxide, vanadium oxide, etc.), metal sulfate, etc. according to a known process (see Shokubai Kouza, Shokubai Jikken Handbook, 1986, page 20, published by Kodan-sha). Commercially available catalysts can also be used.
• the carrier used for the supported catalyst is not specifically limited, and there can be preferably used titanium oxide, alumina, zirconium oxide, zeolite, silica, titanium composite oxide, zirconium composite oxide and aluminum composite oxide, more preferably titanium oxide, zirconium oxide and alumina.
• the ratio of ruthenium to the carrier is preferably from 0.1 to 20% by weight, more preferably from 1 to 5% by weight.
• a third component other than ruthenium can also be added, and examples of the third component include palladium compound, copper compound, chromium compound, vanadium compound, alkali metal compound, rare earth compound, manganese compound, alkaline earth compound, etc.
• the amount of the third component added is usually from 0.1 to 10% by weight based on the carrier.
• a supported ruthenium catalyst can be used after reduction of the catalyst or after oxidation of it.
• the ruthenium oxide catalyst examples include ruthenium oxides such as ruthenium dioxide, ruthenium hydroxide etc., a ruthenium dioxide catalyst and ruthenium hydroxide catalyst etc. according to a known method (see Gensobetsu Shokubai Binran, 1978, page 544, published by Chijinkan). Commercially available ruthenium dioxide can also be used.
• the ruthenium oxide compound such as halogenated ruthenium oxide, in which ruthenium and other elements are combined, are also used.
• ruthenium dioxide for example, there is a method comprising adding an alkali to an aqueous solution of RuCl 3 , precipitating ruthenium hydroxide, washing the precipitate, followed by calcining in the air.
• a catalyst obtained by supporting ruthenium oxide on a carrier is preferably used.
• the carrier include oxide and mixed oxide of elements (e.g. titanium oxide, alumina, zirconium oxide, silica, titanium mixed oxide, zirconium mixed oxide, aluminum mixed oxide, silicon mixed oxide etc.)
• the weight ratio of (ruthenium oxide)/(the carrier) is usually 0.1/99.9 to 70/30.
• the supporting compounds include ruthenium oxide, ruthenium hydroxide, halogenated ruthenium oxide.
• the supporting method of ruthenium oxide for example, there is a method comprising impregnating the carrier with an aqueous solution of RuCl 3 , adding an alkali, precipitating ruthenium hydroxide on the carrier, washing it with water, followed by calcining in the air.
• a method comprising inpregnating the carrier with an aqueous solution of RuCl 3 , drying, followed by oxydative decomposition under the calcination in the air.
• the supported catalyst is usually calcined at 100° C. to 500° C. for about 30 minutes to 5 hours.
• Examples of the catalyst prepared by supporting the ruthenium compound on the carrier include catalysts prepared by supporting compounds such as ruthenium chloride (e.g. RuCl 3 , RuCl 3 hydrate, etc.), salt of chlororuthenate (e.g. K 3 RuCl 6 , RuCl 6 ! 3- , K 2 RuCl 6 , etc.), salt of chlororuthenate hydrate (e.g. RuCl 5 (H 2 O) ! 2- , RuCl 2 (H 2 O) 4 ! + , etc.), ruthenium oxide (e.g. RuO 2 , RuO 4 , etc.), salt of ruthenic acid (e.g.
• ruthenium chloride e.g. RuCl 3 , RuCl 3 hydrate, etc.
• salt of chlororuthenate e.g. K 3 RuCl 6 , RuCl 6 ! 3- , K 2 RuCl 6 , etc.
• salt of chlororuthenate hydrate
• Ru 2 oxychloride e.g. Ru 2 OCl 4 , Ru 2 OCl 5 , Ru 2 OCl 6 , etc.
• salt of ruthenium oxychloride e.g. K 2 Ru 2 OCl 10 , CS 2 Ru 2 Cl 4 , etc.
• ruthenium hydroxide e.g. Ru(NH 3 ) 6 ! 2+ , Ru(NH 3 ) 6 ! 3+ , RU(NH 3 ) 5 H 2 O! 2+ , etc.
• chloride of ruthenium-amine complex e.g. Ru(NH 3 ) 5 Cl!
• Ru(NH 3 ) 6 !Cl 2 Ru(NH 3 ) 6 !Cl 3 , etc.
• ruthenium bromide e.g. RuBr 3 , RuBr 3 hydrate, etc.
• other ruthenium-organic amine complex e.g. RuBr 3 , RuBr 3 hydrate, etc.
• other ruthenium-organic amine complex e.g. RuBr 3 , RuBr 3 hydrate, etc.
• other ruthenium-organic amine complex e.g. RuBr 3 , RuBr 3 hydrate, etc.
• other ruthenium-organic amine complex e.g. RuBr 3 , RuBr 3 hydrate, etc.
• other ruthenium-organic amine complex e.g. RuBr 3 , RuBr 3 hydrate, etc.
• other ruthenium-organic amine complex e.g. RuBr 3 , RuBr 3 hydrate, etc
• ruthenium compound ruthenium chloride, ruthenium chloride-amine complex and ruthenium-carbonyl complex are preferred.
• titanium oxide, zirconium oxide, alumina, silica, titanium mixed oxide, zirconium mixed oxide and aluminum mixed oxide are preferably used. Among them, titanium oxide, alumina, zirconium oxide and silica are particularly preferred.
• the catalyst include a catalyst obtained by calcining the above catalyst, followed by chemically-mixing with the carrier, a catalyst subjected to a reducing treatment and a catalyst subjected to an oxidizing treatment.
• the ratio of the ruthenium compound to the carrier is usually from 0.1 to 20% by weight, preferably from 1 to 10% by weight.
• a third component other than the ruthenium compound can also be added, and examples of the third component include a palladium compound, a copper compound, a chromium compound, a vanadium compound, an alkali metal compound, a rare earth compound, a manganese compound, an alkaline earth compound, etc.
• the amount of the third component added is usually from 0.1 to 10% by weight based on the carrier.
• the supporting process include impregnation process, precipitation supporting process, coprecipitation process, mixing process, etc. Among them, the impregnation process is preferred.
• the impregnation process for example, there is a process comprising suspending a carrier in a solution, which is prepared by dissolving a ruthenium compound in a solvent, evaporating the solvent, followed by drying and further calcining.
• a solvent include water, methanol, organic solvent, etc.
• the supported catalyst is usually calcined at 100° to 500° C. for about 30 minutes to 5 hours.
• the catalyst according to the method for preparing the ruthenium mixed oxide is obtained by chemically-mixing at least one oxide selected from oxides such as titanium oxide, zirconium oxide, alumina, silica, vanadium oxide, boron oxide, chromium oxide, niobium oxide, hafnium oxide, tantalum oxide, tungsten oxide, etc. with ruthenium oxide.
• the compound for chemically-mixing with ruthenium oxide is not limited to the above compounds, and various mixed oxides such as copper chromite, etc. are also used.
• the process for chemically-mixing ruthenium for example, there is a process comprising adding a hydrolyzate of the ruthenium compound (e.g.
• ruthenium chloride etc.
• a hydrolyzate of chloride, oxychloride, nitrate, oxynitrate, alkaline salt of oxy-acid, sulfate, alkoxide, etc. of titanium etc. filtering and washing the mixture, followed by calcining in air.
• the ruthenium compound include compounds described as examples of the catalyst obtained by supporting the ruthenium compound (e.g. ruthenium chloride, etc.) with the carrier. RuCl 3 and RuCl 3 hydrate are preferred.
• Preferred examples of the oxide for chemically-mixing with ruthenium oxide include titanium oxide, zirconium oxide, alumina, silica, titanium mixed oxide, zirconium mixed oxide, aluminum mixed oxide and silicon mixed oxide.
• the process for supporting the ruthenium mixed oxide with the carrier for example, there is a process comprising impregnating the carrier with chloride, nitrate, etc. of titanium and the ruthenium compound such as ruthenium chloride, followed by calcining in air.
• the carrier include titanium oxide, alumina, silica, zirconium oxide or a mixed oxide thereof.
• the amount of the ruthenium oxide contained in the ruthenium mixed oxide is usually from 0.1 to 80% by weight, preferably from 1 to 70% by weight.
• a third component can also be added, and examples of the third component include palladium compound, copper compound, chromium compound, vanadium compound, alkali metal compound, rare earth compound, manganese compound, alkaline earth compound, etc.
• the amount of the third component added is usually from 0.1 to 10% by weight based on the weight of the ruthenium mixed oxide.
• Examples of the process for preparing the ruthenium mixed oxide include coprecipitation process, process due to mixing of precipitate, impregnation process, etc.
• the ruthenium mixed oxide is usually prepared by calcining at 200° to 1000° C. for about 1 to 5 hours.
• Examples of the process for supporting the ruthenium mixed oxide on the carrier include impregnation process, precipitation supporting process, etc.
• the supported catalyst is usually calcined at 200° C. to 1000° C. for about 1 to 5 hours. It is preferably calcined at 300° C. to 500° C. Examples of the calcining atmosphere include nitrogen, air, etc.
• Examples of the catalyst other than the above catalysts include ruthenium black prepared by a known process (see “Shokubai Chousei Kagaku", 1980, page 233, published by Kodan-sha), supported catalyst containing ruthenium (supporting rate: more than 20% by weight), etc.
• chlorine is produced by oxidation of hydrogen chloride with oxygen using a ruthenium catalyst.
• the reaction system in the production of chlorine is not specifically limited, but a flow system is preferred and a fixed bed gas phase flow system is more preferred.
• the reaction temperature is high, the ruthenium oxide in the high oxidation state is sometimes volatilized and, therefore, the reaction is preferably conducted at lower temperature, more preferably from 100° C. to 500° C., most preferably from 200° C. to 380° C.
• the reaction pressure is not specifically limited, but is preferably from about atmospheric pressure to 50 atm.
• the oxygen raw material air may be used as it is or pure oxygen may be used.
• GHSV is preferably from about 10 h -1 to 20000 h -1 , more preferably from about 20 h -1 to 1000 h -1 .
• a catalyst was prepared by the following process. That is, water (8.6 g) was charged in an ice-cooled flask, and commercially available titanium tetrachloride (7.6 g) was added dropwise with stirring to prepare an aqueous titanium tetrachloride solution. Then, a solution prepared by dissolving commercially available zirconium oxychloride octahydrate (13.1 g) in water (43.3 g) was added dropwise to the aqueous titanium tetrachloride solution with stirring to prepare a homogeneous solution.
• the precipitate was washed with distilled water (300 ml) and then filtered again. After this operation was repeated three times, the resultant was dried at 60° C. for 4 hours to obtain 16.3 g of a black solid. This solid was grinded, heated in air from room temperature to 350° C. over 3.5 hours and then calcined at the same temperature for 3 hours to obtain 13.5 g of a black catalyst. According to the same manner as that described above, 55. 4 g of the same catalyst was obtained. The calculated value of the content of the ruthenium oxide was 36% by weight. The resulting powder was granulated to obtain a ruthenium oxide-titanium oxide-zirconium oxide catalyst of 12 to 18.5 mesh.
• the ruthenium oxide-titanium oxide-zirconium oxide catalyst (46.8 g) thus obtained was charged in a quartz glass reaction tube (inner diameter: 22 mm).
• a hydrogen chloride gas (19.0 ml/min.) and an oxygen gas (9.3 ml/min.) were respectively supplied under atmospheric pressure (converted on the basis of 0° C., 1 atm).
• the quartz glass reaction tube was heated with an electric furnace to adjust the inner temperature (hot spot) to 265° C.
• the gas at the reaction outlet was sampled by passing it through an aqueous 30% potassium iodide solution, and then the amount of chlorine formed and amount of the non-reacted hydrogen chloride were respectively determined by iodometric titration and neutralization titration processs. As a result, the conversion of hydrogen hydrochloride was 95.9% .
• the ruthenium oxide-titanium oxide-zirconium oxide catalyst which is the same as that used in Example 1 (2.5 g) was diluted by mixing sufficiently with a titanium oxide catalyst of 12 to 18.5 mesh (5 g), followed by charging in a quartz glass reaction tube (inner diameter: 12 mm). A hydrogen chloride gas (200 ml/min.) and an oxygen gas (200 ml/min.) were respectively supplied under atmospheric pressure (converted on the basis of 0° C., 1 atm). The quartz glass reaction tube was heated with an electric furnace to adjust the inner temperature (hot spot) to 301° C.
• the gas at the reaction outlet was sampled by passing it through an aqueous 30% potassium iodide solution, and then the amount of chlorine formed and amount of the non-reacted hydrogen chloride were respectively determined by iodometric titration and neutralization titration processs.
• the catalyst activity of chlorine formation per unit weight of the catalyst determined by the following equation was 7.35 ⁇ 10 -4 mol/min g catalyst.
• the catalyst activity of chlorine formation per unit weight of catalyst (mol/min g catalyst) amount of outlet chlorine formed (mol/min)/weight of catalyst (g).
• a catalyst was prepared by the following process. That is, water (27.0 g) was charged in an ice-cooled flask, and commercially available titanium tetrachloride (14.3 g) was added dropwise with stirring to prepare an aqueous titanium tetrachloride solution. Water (1222 g) was added to the solution at room temperature, and then a solution of urea (27.6 g) and water (100 g) was poured into the solution, followed by stirring to prepare an homogeneous solution. Then, the homogeneous solution was stirred with heating to 100° C. for 2 hours. A white precipitate was formed gradually.
• a catalyst was prepared by the following process. That is, an aqueous 20 wt % (as TiOSO 4 ) titanium sulfate solution (54. 7 g, manufactured by Wako Junyaku Kogyo Co., Ltd.) was diluted with water (110.3 g). The resulting solution was charged in an ice-cooled flask, and an aqueous 25 wt % ammonia solution (48.2 g) was added dropwise with stirring. As a result, a white precipitate was formed gradually. After stirring at room temperature for 30 minutes, the precipitate was filtered. The precipitate was washed with distilled water (300 ml) and then filtered again.
• an aqueous 20 wt % (as TiOSO 4 ) titanium sulfate solution 54. 7 g, manufactured by Wako Junyaku Kogyo Co., Ltd.
• the black precipitate was filtered, washed with distilled water (300 ml) and then filtered again. After this operation was repeated three times, the resultant was dried at 60° C. for 4 hours to obtain 12.0 g of a black solid. This solid was grinded, heated in air from room temperature to 350° C. over 3.5 hours and then calcined at the same temperature for 3 hours to obtain 9.9 g of a black catalyst. The calculated value of the content of the ruthenium oxide was 46% by weight. The resulting powder was granulated to obtain a ruthenium oxide-titanium oxide catalyst of 12 to 18.5 mesh.
• Example 2 According to the same manner as that described in Example 2 except for charging the obtained ruthenium oxide-titanium oxide catalyst (2.5 g) in a reaction tube and adjusting the inner temperature to 299° C., the reaction was conducted.
• the catalyst activity of chlorine formation per unit weight of the catalyst at the time at which 2.6 hours had passed since the beginning of the reaction was 7.35 ⁇ 10 -4 mol/min g catalyst.
• a catalyst was prepared by the following method. That is, commercially avilable titanium tetrabutoxide (15.4 g) was disolved in ethanol (52 ml). Then, a solution prepared by dissolving commercially avilable ruthenium chloride hydrate (RuCl 3 . nH 2 O) (10.1 g) in water (122 ml) and a solution prepared by dissolving sodium hydroxide (14.8 g, content 96%) in water (60 ml) were mixed and stirred, after stirring, the mixed solution was immediately added dropwise to the ethanol solution of titanium tetrabutoxide with stirring. As the solution was added dropwise, a precipitate was formed. After adding, the black suspension was stirred at room temperature sufficiently.
• commercially avilable titanium tetrabutoxide (15.4 g) was disolved in ethanol (52 ml). Then, a solution prepared by dissolving commercially avilable ruthenium chloride hydrate (RuCl 3
• ruthenium oxide hydrate (RuO2, manufactured by Aldrich Chemical Co.) was granulated to obtain a ruthenium oxide catalyst of 12 to 18.5 mesh.
• Example 2 According to the same manner as that described in Example 2 except for charging the obtained ruthenium oxide catalyst (2.5 g) in a reaction tube and adjusting the inner temperature to 300° C., the reaction was carried out.
• the catalyst activity of chlorine formation per unit weight of the catalyst at the time at which 1.5 hours had passed since the beginning of the reaction was 5.35 ⁇ 10 -4 mol/min. g-catalyst.
• a 2 wt % spherical ruthenium-titanium oxide catalyst having a particle size of 3 mm ⁇ (manufactured by N.E. Chemcat Co.) was grinded to adjust the particle size to 12 to 18.5 mesh.
• this ruthenium-titanium oxide catalyst 2.5 g
• a reaction tube without diluting with a titanium oxide carrier supplying a hydrogen chloride gas (190 ml/min.) and adjusting the inner temperature to 300° C.
• the catalyst activity of chlorine formation per unit weight of the catalyst at the time at which 1.5 hours had passed since the beginning of the reaction was 1.38 ⁇ 10 -4 mol/min g catalyst.
• the 2 wt % ruthenium-titanium oxide catalyst which is the same as that used in Example 7 was grinded to adjust the particle size to 12 to 18.5 mesh. According to the same manner as that described in Example 2 except for charging the catalyst (2.5 g) in a reaction tube without diluting with a titanium oxide carrier, supplying a hydrogen chloride gas (196 ml/min.) and an oxygen gas (170 ml/min.) and adjusting the inner temperature to 380° C., the reaction was conducted.
• the catalyst activity of chlorine formation per unit weight of the catalyst at the time at which 2 hours had passed since the beginning of the reaction was 11.4 ⁇ 10 -4 mol/min g catalyst.
• a 2 wt % ruthenium-zirconium oxide catalyst (1/8 inch pellet, manufactured by N.E. Chemcat Co.) was grinded to adjust the particle size to 12 to 18.5 mesh.
• this ruthenium-zirconium oxide catalyst (2.5 g) in a reaction tube without diluting with a titanium oxide carrier, supplying a hydrogen chloride gas (196 ml/min.) and an oxygen gas (170 ml/min.) and adjusting the inner temperature to 380° C., the reaction was conducted.
• the catalyst activity of chlorine formation per unit weight of the catalyst at the time at which 3 hours had passed since the beginning of the reaction was 7.9 ⁇ 10 -4 mol/min g catalyst.
• the residual hydrogen chloride flow was 4.7 ⁇ 10 -3 mol/min.
• a 5 wt % ruthenium-alumina powder catalyst (manufactured by N.E. Chemcat Co.) was granulated to obtain a catalyst of 12 to 18.5 mesh. According to the same manner as that described in Example 2 except for charging this granulated ruthenium-aluminum catalyst (2.5 g) in a reaction tube without diluting with a titanium oxide carrier, supplying a hydrogen chloride gas (193 ml/min.) and adjusting the inner temperature to 380° C., the reaction was conducted. The catalyst activity of chlorine formation per unit weight of the catalyst at the time at which 10 hours had passed since the beginning of the reaction was 6.7 ⁇ 10 -4 mol/min g catalyst.
• a catalyst was prepared by the following process. That is, silica AEROSIL 300 (18.70 g, manufactured by Nihon Aerosil Co., Ltd.) was suspended in an aqueous solution of commercially available ruthenium chloride hydrate (RuCl 3 nH 2 O, 1.02 g) and water (80 g), and then the mixture was evaporated to dryness at 55 to 60° C. using a rotary evaporator and heated in a nitrogen flow at 150° C. for one hour to obtain 18.1 g of a green-black ruthenium chloride catalyst. The ratio of RuCl 3 to the carrier was 5% by weight. This catalyst was granulated to obtain a catalyst of 12 to 18.5 mesh.
• Example 2 According to the same manner as that described in Example 2 except for charging the resulting ruthenium chloride catalyst (5 g) in a reaction tube without diluting with a titanium oxide carrier, supplying a hydrogen chloride gas (194 ml/min.) and adjusting the inner temperature to 380° C., the reaction was conducted.
• the catalyst activity of chlorine formation per unit weight of the catalyst at the time at which 5 hours had passed since the beginning of the reaction was 5.9 ⁇ 10 -4 mol/min g catalyst.
• a catalyst was prepared by the following process. That is, chromium nitrate enneahydrate (60.3 g) was dissolved in water (600 ml) and the solution was heated to 45° C. Then, 25 wt % ammonia water (64.9 g) was added dropwise over 1.5 hours with stirring, followed by stirring at the same temperature for additional 30 minutes. Water (3.3 liter) was added to the formed precipitate and, after standing overnight to cause sedimentation, the supernatant was removed by decantation. Then, water (2.7 liter) was added, followed by stirring sufficiently for 30 minutes. After the precipitate was washed by repeating this operation five times, the supernatant was removed by decantation.
• Example 2 According to the same manner as that described in Example 2 except for charging the resulting Cr 2 O 3 --SiO 2 catalyst (2.5 g) in a reaction tube without diluting with a titanium oxide carrier, supplying a hydrogen chloride gas (192 ml/min.) and adjusting the inner temperature to 301° C., the reaction was conducted.
• the catalyst activity of chlorine formation per unit weight of the catalyst at the time at which 3.7 hours had passed since the beginning of the reaction was 0.19 ⁇ 10 -4 mol/min g catalyst.
• Example 2 According to the same manner as that described in Example 2 except for charging the Cr 2 O 3 --SiO 2 catalyst (2.5 g) used in Comparative Example 1 in a reaction tube without diluting with a titanium oxide carrier, supplying a hydrogen chloride gas (192 ml/min.) and adjusting the inner temperature to 380° C., the reaction was conducted.
• the catalyst activity of chlorine formation per unit weight of the catalyst at the time at which 5.8 hours had passed since the beginning of the reaction was 2.1 ⁇ 10 -4 mol/min g catalyst.
• Example 2 According to the same manner as that described in Example 2 except for charging the Cr 2 O 3 --SiO 2 catalyst (5 g) used in Comparative Example 1 in a reaction tube without diluting with a titanium oxide carrier, supplying a hydrogen chloride gas (96.5 ml/min.) and adjusting the inner temperature to 380° C., the reaction was conducted.
• the catalyst activity of chlorine formation per unit weight of the catalyst at the time at which 5 hours had passed since the beginning of the reaction was 2.7 ⁇ 10 -4 mol/min g catalyst.

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• 1996
  • 1996-05-14 CA CA002176541A patent/CA2176541A1/fr not_active Abandoned
  • 1996-05-14 NO NO961970A patent/NO961970L/no not_active Application Discontinuation
  • 1996-05-14 SG SG1996009799A patent/SG67942A1/en unknown
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  • 1996-05-16 TW TW085105819A patent/TW415920B/zh not_active IP Right Cessation
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  • 1996-05-17 US US08/648,976 patent/US5871707A/en not_active Expired - Lifetime
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